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the doors locked and not open the door unless there is a uniform identified law enforcement officer on the other side of it. >> part of that process included controlled explosions. police say it was done merely out an abundance of caution. authorities hoping for some evidence as to dzhokhar's whereabouts. nbc news national investigative correspondent michael issakof is on the ground. >> we've been promised a briefing for several hours now that was going to give us an update on where things stood. clearly, it's a fluid situation. the last one we got just about an hour and a half ago was there have been some new leads authorities were pursuing. what that meant we do not know. clearly they do not have tsarnaev in custody right now. they still have very deep concerns about the threat he poses and the threat that others -- that an accomplice or accomplices may pose. and the most significant threat of all is the fact there might be ieds out there like the one found this morning that have been -- that have left on the streets of boston. making it very difficult, even if they get tsarnaev,
-off from the local community to law enforcement. so we have focused so much on specific ethnic groups since 9/11 in terms of potential threats. maybe we need to open the aperture a little bit. not because the communities pose a threat to the united states but because there are individuals we need to pay attention to. >> when you talk about other groups, not al qaeda but other overseas groups that you might want to investigate. other people in the new york times are saying there might have been other parts to this attack. there is a significant arsenal assembled by these guys. are you comfortable this is a two-person plot or that there may have been some other people we haven't yet seen who are advising or perhaps even funding part of this? >> i think there is no doubt that because of the seven or eight ieds that they've discovered since the capture of tsarnaev, they were planning additional attacks. the question is what were they and what would they be? >> my guess and this is a semieducated guest. we'll find other people who were tangentially involved. unwitting accomplices, providing logi
law enforcement investigation to try to get to the point where you can identify who's the culprit of this. >> don, there are thousands of people working on this and several agencies at the federal, state, and city level. i just want to run through some of the names. the fbi, the doj, the dod, the atf, homeland security, home security task force, the national guard, the massachusetts state police, the boston p.d. and the boston bay transportation authority police. alphabet soup of people working together. obviously there are advantages when you have lots of organizations working and surely there are challenges when you have lots of organizations working together. does one agency typically take charge, typically the fbi or dod and how do the ajegencies work differently. ? >> think part of the new world, all the organizations get together and depending on the type of crime or type of tragedy that's taken place, one agency takes the lead on this. in this case it appears to be the fbi. but we've learned through investigation and think the law enforcement has really worked on this is to
at m.i.t. let's talk about law enforcement. what are they looking for now? how do they go about this investigation? take us through some of those steps? and within that, we have to start forming some theories. from what we know already, do you think that it is maybe an individual or probably a group and how do you go about figuring out, is this a foreign group or individual, or americans? >> yeah. those are big questions and there are a lot of them. let me start in the beginning and say in terms of the phase of the investigation, i think there are different parts and different parts of the government are handling different parts of the investigation. so obviously, the most important and immediate thing are those events and evidence that are near the attack. that are approximate to the attack. that includes the crime scene. that includes the material used in the bomb and the process of reconstructing what that bomb looked like. it is designed, the materials it used. the nature of the timer that was used. then there is a whole separate line of inquiry at surveillance video that mi
Search Results 0 to 4 of about 5 (some duplicates have been removed)

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